Add support for transcode uri

index.js

@@ -1,7 +1,5 @@
 function handler(event) {
-  var EXPIRED_REDIRECT_PREFIX = '<EXPIRED_REDIRECT_PREFIX>';
   var request = event.request || {};
-  var querystring = request.querystring || {};
   var uri = request.uri || '';
 
   // pass-through root/favicon
@@ -16,14 +14,25 @@ function handler(event) {
     parts.shift();
   }
 
+  if (parts[0] === 't') {
+    return handleTranscode(request, parts);
+  } else {
+    return handleDigest(request, parts);
+  }
+}
+
+function handleDigest(request, parts) {
+  var EXPIRED_REDIRECT_PREFIX = '<EXPIRED_REDIRECT_PREFIX>';
+
   // just kick out invalid looking paths
-  // either: /podcast_id/episode_guid/digest/filename.mp3
-  //     or: /podcast_id/feed_id/episode_guid/digest/filename.mp3
+  // /podcast_id/episode_guid/digest/filename.mp3
+  // /podcast_id/feed_id/episode_guid/digest/filename.mp3
   if (parts.length !== 4 && parts.length !== 5) {
     return { statusCode: 404, statusDescription: 'Not found. Like, ever.' };
   }
 
   // kick back expired redirects (TODO: require ?exp later on)
+  var querystring = request.querystring || {};
   if (querystring.exp) {
     var now = Math.round(Date.now() / 1000);
     if (now > parseInt(querystring.exp.value, 10)) {
@@ -44,7 +53,7 @@ function handler(event) {
   // TEMPORARY: just kick out short/fake looking digests (2nd to last)
   var digest = parts[parts.length - 2];
   if (digest.length < 20 && digest !== 'some-digest') {
-    return { statusCode: 404, statusDescription: 'Not found. Like, ever.' };
+    return { statusCode: 404, statusDescription: 'Not found. Like, what?' };
   }
 
   // normalize stitch requests to /<podcast_id>/<episode_guid>/<digest>
@@ -56,9 +65,21 @@ function handler(event) {
 
   // force restitching the arrangement by adding a random string to the url
   // TODO: REAAAALLY need to sign/secret this one somehow
+  var querystring = request.querystring || {};
   if (querystring.force) {
     request.uri += `/force-${Date.now()}`;
   }
 
   return request;
 }
+
+function handleTranscode(request, parts) {
+  // just kick out invalid looking paths
+  // /t/a/path/<file>/<format>.<extension>
+  // /t/<host>/[<path>/]<file>/<format>.<extension>
+  if (parts.length < 4) {
+    return { statusCode: 404, statusDescription: 'Not found. Nope.' };
+  }
+
+  return request;
+}

index.test.js

@@ -41,7 +41,7 @@ describe('handler', () => {
     expect(handler(event1)).toEqual(event1.request);
   });
 
-  it('allows non-expiring links through', async () => {
+  it('allows non-expiring digest links through', async () => {
     const event1 = event('/1234/some-guid/some-digest/file.mp3');
     expect(handler(event1)).toEqual(event1.request);
 
@@ -139,4 +139,24 @@ describe('handler', () => {
     expect(result1.uri).toMatch('/1234/some-guid/some-digest/force-');
     expect(result1.uri).toMatch(/force-[0-9]+/);
   });
+
+  it('404s on bad looking transcode paths', async () => {
+    expect(handler(event('/t')).statusCode).toEqual(404);
+    expect(handler(event('/t/path')).statusCode).toEqual(404);
+    expect(handler(event('/t/some/path')).statusCode).toEqual(404);
+  });
+
+  it('allows transcode links through', async () => {
+    const event5 = event('/t/some.domain.com/test.wav/72.1.16000.m4a');
+    expect(handler(event5)).toEqual(event5.request);
+
+    const event6 = event('/t/a/up/guid1/test.wav/72.1.16000.m4a');
+    expect(handler(event6)).toEqual(event6.request);
+
+    const event7 = event('/t/a/up/p1/p2/guid1/test.wav/72.1.16000.m4a');
+    expect(handler(event7)).toEqual(event7.request);
+
+    const event8 = event('/t/some.com/p1/p2/p3/p4/test.wav/72.1.16000.m4a');
+    expect(handler(event8)).toEqual(event8.request);
+  });
 });